Abstract
Thermal diffusivity is an important physical parameter for assessing thermal damage to granite. In this paper, hornblende granite and alkaline granite were subjected to cooling and heating cycles at different temperatures. The quenching cycles of hornblende granite are 1, 5, 10, 15 and 20 times between 250 °C and 650 °C. The quenching cycle of the alkaline granite is 1, 5, 10 and 15 times in the range of 250 °C–450 °C, respectively. The thermal diffusivity of the two types of granite was measured. The experimental results show that the thermal diffusivity of amphibole granite and alkaline granite decreases with the increase of the number of cycles at a given heat treatment temperature. When the number of cycles is constant, the thermal diffusivity decreases as the temperature increases.
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